Malicious PDF — malware analysis report

Static analysis result for SHA-256 1753405a28b02c55…

MALICIOUS

PDF

66.7 KB Created: 2021-05-01 15:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91a12d8322d41c9d90284808e77b7471 SHA-1: a63f4442729d539d93baeb9654cb30f063fd172e SHA-256: 1753405a28b02c55a0aae752793ea0d136c2108fc3fd21b73d3987ce5f53d6de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9690

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816499a243e---nuraj.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d1f6dd80---38435773853.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/g2d8hfb160mbhg8dkb12sui41h/28832939900.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7266e208f383e705868172602ee7e010/pomikovomab.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/09cac158225e7c3a4848403b350d030e/xiraf.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160732dab66556---71787761386.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/36d8c0d1f63796c13072e2fd872002bd/zaxakupumolewix.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833da6df538---vekudowebiluki.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/5463656eacf08e3103e9157f23a507bd/22156931878.pdf
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/56acad4e42e69de711aaf63534d50c38/54469522972.pdf
    • http://ahkjt.com/upfile/file/ritotagore.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/207eb1b7f741c7faede703b0b41de0e1/vinudipafemi.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3494dd8ed60630751adf81dd7bbc1627/rebokipefalik.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b958fd3bd8---39939921379.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/qmamk9m5dtrse10sigp5nhej9q/73745826491.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/354f2d47472e9cceca25bbd642b06751/32485773610.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891cd1204ed---ferivirulutefo.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8e731ba4---58216690795.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=galacticraft+space+station
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d789.bin
471acf1f372e5d0e9cf43bb8025ac0fa77b4d02924afa8ae4d675dadb6d62c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 5040 bytes
font_01_sfnt_off0000e8bf.bin
e52d82bc81f229659e3dac5480f95d7ae04cbe8f63fa4dab0b8ad0503ef4271a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 10060 bytes

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